effects of cosmetics and personal hygiene products on normal resident skin microflora

[B.K. Saundh]

Please can anyone help me on how the skin microflora is effected by cosmetics 
and if the flora has changed over the years due to the use of products on the 
skin and if so how.Could someone also give me addresses of large companies 
that make products for the skin, so i can write to their research groups for 
more information.
                   thankyou for reading this.